file - Saving custom object to sdcard (Android) -


i'm exploring saving internally versus saving on sdcard. currently, i'm trying save custom object (dummytwice) on sdcard, so: 

            string root = (environment.getexternalstoragedirectory().tostring());             file dir = new file(root + pub_ext_dir);             dir.mkdirs();             file file = new file(dir,file_name);              try {                  dummytwice dt = new dummytwice(textenter.gettext().tostring());                 fileoutputstream os = new fileoutputstream(file);                 objectoutputstream oos = new objectoutputstream(os);                 oos.writeobject(dt);                 oos.close();                 os.close();                  toast.maketext(v.getcontext(),"object saved",toast.length_short).show();                 toast.maketext(v.getcontext(),file.getabsolutepath(), toast.length_long).show();              } catch (filenotfoundexception e) {                 e.printstacktrace();             } catch (ioexception e) {                 e.printstacktrace();             }

execution stops at: 

fileoutputstream os = new fileoutputstream(file);

catching exception: 

filenotfoundexception e

what doing wrong? relevant constants:

private final static string pub_ext_dir = /data private final static string file_name = /obj.dat

you shouldn't write directly on sdcard, , should use 

getexternalfilesdir(null)

instead of

environment.getexternalstoragedirectory()

getexternalfilesdir(null) returns private path on sdcard activity, /sdcard/android/data/package.your.app


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